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AI.XII.C.K2aFAA-S-ACS-25 · Nov 2023Knowledge

a. Electrical malfunction

ACS element text (the applicant demonstrates understanding of)

System and equipment malfunctions specific to the aircraft, including: a. Electrical malfunction

Bottom line

A full-scale minus deflection indicates a malfunction of the alternator/generator. A full-scale positive deflection indicates a malfunction of the regulator. Pilots should refer to the appropriate checklist when an electrical fault occurs.

Key numbers

Key numbers for a. Electrical malfunction
NumberWhat it means
approximately 14 volts for a 12-volt batteryBattery feed
28 volt 400 cycle AC powerTurboprop AC

FAA references

  1. PHAK ch. 7 (p. 7-31) — FAA-H-8083-25C (2023)
  2. AFH ch. 15 (pp. 15-10–15-11) — FAA-H-8083-3C
  3. AFH ch. 13 (p. 13-9) — FAA-H-8083-3C
  4. RMH ch. 3 (p. 3-8) — FAA-H-8083-2A
  5. AIH ch. 1 (p. 1-25) — FAA-H-8083-9B
  6. FAA-S-ACS-25 AI.XII.C.K2a and S1 — FAA-S-ACS-25
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